Verb or Noun To Shoulder Bag is for one to announce their presence to a bar, party, or honestly any get together- by gently placing their ball sack on a friend's shoulder. Eventually the friend will feel the weight, sense a presence, or happen to glance, or see in their peripheral vision- a bag of balls connected to their friend.

Trish was not phased at all. Whilst recounting a hilarious story, she glanced down, noticed testicles on her shoulder, and nonchalantly announced, "Oh, Fronk is here." Her audience roared at the shoulder bag.